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Geologic Unit: Maguayo
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Map showing publication footprint
  • Usage in publication:
    • Maguayo Porphyry*
  • Modifications:
    • Named
  • Dominant lithology:
    • Porphyry
Publication:

Mattson, P.H., 1973, Middle Cretaceous nappe structures in Puerto Rican ophiolites and their relation to the tectonic history of the Greater Antilles: Geological Society of America Bulletin, v. 84, no. 1, p. 21-38.


Summary:

The Maguayo Porphyry of the Bermeja Complex, here named, consists of tan or light-gray, microcrystalline aplitic matrix with feldspar and hornblende phenocrysts. Occurs in dikes and sill cutting the Cajul Volcanic Rocks and Mariquita Chert, and in fensters and valleys cut through the Bermeja nappe.

Source: GNU records (USGS DDS-6; Reston GNULEX).


Map showing publication footprint
  • Usage in publication:
    • Maguayo Porphyry*
  • Modifications:
    • Overview
Publication:

Volckmann, R.P., 1984, Geologic map of the San German quadrangle, southwest Puerto Rico: U.S. Geological Survey Miscellaneous Investigations Series Map, I-1558, 1 sheet, scale 1:20,000


Summary:

The Maguayo Porphyry of Mattson (1973) is here adopted for USGS usage. Intrudes the Mariquita Chert of Tithonian to Aptian age; therefore its age is Early Cretaceous or younger.

Source: GNU records (USGS DDS-6; Reston GNULEX).


For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates published by U.S. Geological Survey authors.

"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).

Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).

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